package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;
import org.springframework.util.CollectionUtils;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.237.137:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //2.消费者对象
        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);
        //3.订阅主题
        kafkaConsumer.subscribe(Collections.singletonList("itheima-topic"));

        try {
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofMillis(1000));
                consumerRecords.forEach(record -> {
                    System.out.println(record.key());
                    System.out.println(record.value());
                    System.out.println(record.offset());
                    System.out.println(record.partition());
                });
                //异步提交偏移量
                kafkaConsumer.commitAsync();
            }
        }catch (Exception e){
            System.out.println("记录错误的信息"+e);
            e.printStackTrace();
        } finally {
            //同步提交
            kafkaConsumer.commitSync();
        }
                //当前线程一直处于监听状态
//        while (true) {
//            //4.获取消息
//            ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofMillis(1000));
//            consumerRecords.forEach(record -> {
//                System.out.println(record.key());
//                System.out.println(record.value());
//                System.out.println(record.offset());
//                System.out.println(record.partition());
//                //同步提交偏移量
////                try{
////                  kafkaConsumer.commitSync();
////                } catch (CommitFailedException e){
////                    System.out.println("同步提交偏移量失败！");
////                    e.printStackTrace();
////                }
//                //异步提交偏移量
////                kafkaConsumer.commitAsync(new OffsetCommitCallback(){
////                    @Override
////                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
////                        if (e != null) {
////                            System.out.println("记录错误的提交偏移量:"+map+",异常信息为"+e);
////                        }
////                    }
////                });
//
//
//            });
//        }
            }

        }
